How to run Firefox in a chroot jail?

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http://unix.stackexchange.com – I've got this chroot jail all setup. I try to run Firefox in it, and get the message: "Gtk-WARNING ** cannot open display: " I know I have to invoke Firefox with --display= something. I probably also have to set the DISPLAY environmental variable to something as well. But I've tried all kinds of combinations, and can't get it to work in the chroot jail. Thanks. (HowTos)